/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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 */
package org.hisp.dhis.jdbc.dialect;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.HashMap;
import java.util.Map;
import org.hisp.quick.StatementDialect;
import org.springframework.beans.factory.FactoryBean;

/**
 * @author Lars Helge Overland
 */
public class StatementDialectFactoryBean implements FactoryBean<StatementDialect> {
  private static Map<String, StatementDialect> dialectMap;

  static {
    dialectMap = new HashMap<>();
    dialectMap.put("org.hibernate.dialect.MySQLDialect", StatementDialect.MYSQL);
    dialectMap.put("org.hibernate.dialect.PostgreSQLDialect", StatementDialect.POSTGRESQL);
    dialectMap.put(
        "org.hisp.dhis.hibernate.dialect.DhisPostgresDialect", StatementDialect.POSTGRESQL);
    dialectMap.put("org.hibernate.dialect.HSQLDialect", StatementDialect.HSQL);
    dialectMap.put("org.hibernate.dialect.H2Dialect", StatementDialect.H2);
    dialectMap.put("org.hisp.dhis.hibernate.dialect.DhisH2Dialect", StatementDialect.H2);
  }

  private final String dialectTypeKey;

  // -------------------------------------------------------------------------
  // Dependencies
  // -------------------------------------------------------------------------

  public StatementDialectFactoryBean(String dialectTypeKey) {
    checkNotNull(dialectTypeKey);
    this.dialectTypeKey = dialectTypeKey;
  }

  private StatementDialect statementDialect;

  // -------------------------------------------------------------------------
  // Initialisation
  // -------------------------------------------------------------------------

  public void init() {
    statementDialect = dialectMap.get(dialectTypeKey);

    if (statementDialect == null) {
      throw new RuntimeException("Unsupported dialect: " + dialectTypeKey);
    }
  }

  // -------------------------------------------------------------------------
  // FactoryBean implementation
  // -------------------------------------------------------------------------

  @Override
  public StatementDialect getObject() {
    return statementDialect;
  }

  @Override
  public Class<StatementDialect> getObjectType() {
    return StatementDialect.class;
  }

  @Override
  public boolean isSingleton() {
    return true;
  }
}
